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Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Cash flows from operating activities    
Net loss $ (15,367) $ (3,660)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:    
Depreciation expense 835 518
Share-based compensation 1,393 257
Fair value adjustment of warrant liabilities   72
Changes in operating assets and liabilities:    
Accounts receivable (641) (2,107)
Prepaid expenses (1,128) 67
Other assets (229)  
Accounts payable 808 (1,620)
Accrued expenses (274) (296)
Lease exit liability (703) (307)
Deferred revenue 17,193 (6,772)
Deferred rent (151) 53
Net cash provided by (used in) operating activities 1,736 (13,795)
Cash flows from investing activities    
Purchases of property and equipment (1,242) (876)
Net cash used in investing activities (1,242) (876)
Cash flows from financing activities    
Proceeds from issuance of common stock, net of offering costs 77,039 709
Net cash provided by financing activities 77,039 709
Net change in cash and cash equivalents 77,533 (13,962)
Cash and cash equivalents at beginning of period 116,481 47,743
Cash and cash equivalents at end of period $ 194,014 $ 33,781